Synthesis of 3,4-bridged indoles by photocyclisation reactions. Part 1. Photocyclisation of halogenoacetyl tryptophan derivatives
作者:Anthony L. Beck、Mark Mascal、Christopher J. Moody、Alexandra M. Z. Slawin、David J. Williams、William J. Coates
DOI:10.1039/p19920000797
日期:——
results in a poor yield of photocyclisation to the indole 4-position due to competing cyclisation to C-2, the photocyclisation of (dichloroacetyl)tryptophan derivatives gives, after addition of a nucleophile in work-up, 7-substituted pyrrolobenzazocines in good yield and with trans-stereospecificity. N-(Trichloroacetyl)tryptophan derivatives also undergo photocyclisation to give 3,4-bridged indoles